Calculating machine



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ATTORNEY prises two digts,

units order of the bined and simultaneously entered into order of the totalizer, and the 6 would be entered into the hundreds order of the totalizer, 45

Patented Aug. 26, 1941 PATENT OFFICE 2,253,148 cALcULA'riNG MACHINE Harold T.

Avery, Oakland, Calif.; assignor to Marchant Calculating Machine Company, a corporation of California Application September 23, 1935, Serial No. 41,671

l Claims.

The partial `products" type of calculator is distinguished by the fact""that its actuating mechanlsmds controlled jointly by two groups of numeral keys which act through tabular controlling devices to effect operation of the actuator so as to register the product oithe numeral keys operated in each group,`the term tabular controlling devices being used as a general designation of any of various forms of mechanism empirically constructed according to the multiplication table to effect such a result. Since the product of two digits 'greater than three comit is necessary in such calculating machines to provide means whereby the tabular controlling devices may exercise control over two orders of the actuating mechanism.

In prior devices this has been done by dividing the multiplying cycle into two phases; in the rlrst portion of which the units order digits ofthe products of each multiplicand digit and the multiplier digit are entered into the totalizer, and in the second phase of which the tens order digits of these products are similarly entered.

Thus, in multiplying 'l5 9, the ilrst phase of operation would effect the entry of into the totalizer, and 3 into the tens order of the totalizer; while the second phase would effect the entry of 4 into the tens order of the totalizer and "6 into the hundreds order of the totalizer, giving a product of 675.

'Ihe present invention contemplates `the elimination of two suchseparate phases of operation during the cycle, and the effecting of the complete operation in a single phase of operation by providing means whereby the units and tens order digits of a. plurality of such products may be simultaneously entered into any given orderl of the totalizer as a single sum. Utilizing the mechanism of the present invention for the performance cf the problem above set forth, "5 would be entered into the units order of the totalizer while the "4 and the "3 would be comthe tens all in a single cycle.

The invention will be best understood from a 'consideration of a specific embodiment thereof disclosed in the accompanying drawings, in which:

Figure 1 is a plan view of the machine showing the registering mechanism and calculationcontrol devices. Figure 2 is a longitudinal sectional view of a multiplicand order with parts broken away t show the key-controlled contact and selection controlling solenoid mechanism.

Figure 3 is a partial lateral sectional view taken on line 3--3 of Fig. 2 of several multiplicand orders, showing the multiplier gang switches in detail.

Figure 3A is a detail sectional view taken on l line 3A-3A of Fig. 2 showing the lateral interconnection of the units and tens stop bars.

Figure 4 is a detail sectional view of the carriage dipping mechanism.

Figure 5 is a detail sectional view of the selection segment operating mechanism.

Figure 6 is a detail sectional view of the segment locking gate and its control mechanism.

Figures 7, 8, 9', and 10 are sectional views of the registering mechanism mounted in the laterally shiftable carriage.

Figure 11 is an enlarged detail view of two decimal orders of the registering mechanism, partly in section.

Figure 12 is a longitudinal 'sectional view of the multiplier control mechanism.

Figure 13 is a detail lateral sectional view of the multiplier control mechanism.

Figure 14 is an additional longitudinal sectional view taken on line |4-l4 of Fig. 13 of additional portions of the multiplier control mechanism..

Figure 15 is ya longitudinal sectional view illustrating the control of the multiplier registering mechanism.

Figure 16 is a longitudinal sectional view illustrating the automatic and manual mechanisms for clearing the multiplicand keyboard.

. Figure 17 is a lateral view in elevation of details of the main clutch line and control cams driven thereby.

tract bar mechanism. l

Figure 19 is a detail vof linkages controlled by the add and subtract bar mechanisms for automatically clearing the multiplicand keyboard and controlling other mechanism.

Figure 20 is a detail of the lock mechanism' for the subtraction control.

Figures 21 to 25 are detail views of the reversing mechanism for controlling 'subtraction operation.

Figures 26 and 2,7 are detail views of the mechanism for controlling negative multiplication operation.

Figure 28 is.-a detail view of the special leverage system for controlling operation of the clutch .55 -by means of the multiplier keys.

Figure 18 ls a detail view of the' add and sub- I 

